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Customs Cooling fan type, mechanical or electric?

Discussion in 'The Hokey Ass Message Board' started by Karl M, Jun 10, 2020.

  1. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Whats every ones idea on a cooling fan? Electrical fan or mechanical fan off the water pump. PO dropped a 350 in the wagon, having cooling issues. The current fan is 14.5 inches. I was thinking about installing a 16 inch electric fan with a shroud. The rad is new tri cross flow 26 inch. I could build a shroud for the current set up but would rather upgrade if better. Not sure about using an electric fan....
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 46,066

    squirrel
    Member

    Pictures of the front of the engine, radiator, etc from a few different angles are a big help.

    If the fan that's in it is the biggest mechanical fan that will fit, then you'll probably have to go electric.
     
  3. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Yes 14.5 is as big as a mechanical fan it can take.The blades almost hit the bottom frame. Motor sits a little low and to the right.
     
  4. Air flow is the most critical component of the engine cooling process. mechanical fans with thermostat control are the best, hands down. But they often don't fit and let's face it, don't look hot rod. There are very few after market electrics that are up to the job. Plastic ones with narrow blades are always suspect. I run an aluminum bladed pusher fan on my Willys and it moves enough air to do the job nicely on my 354 hemi. I have room for little else. There is a great OEM plastic electric fan that really works well. It is a Ford item made for Thunderbirds and Lincoln Mark VIII. It is even a 2-speed motor so with the proper controller can be further tuned. Comes with a built in shroud. Always on ebaY can usually be gotten for around $100 if you are patient.
    s-l1600.jpg
     
    Texas57, Elcohaulic and 67L36Driver like this.
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  5. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    It has a push fan in front of the radiator, but in 90 degrees sitting in traffic ... I went on a covid retirement parade and it was slow going in 90 plus degrees, I had to bail out of the parade . Temp got to hot.
     
    warbird1 likes this.
  6. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Great, been researching, just have to stay away from the junk ......
     
  7. BJR
    Joined: Mar 11, 2005
    Posts: 6,327

    BJR
    Member

    I would try to keep the mechanical fan and build or adapt a shroud from something else. Also make sure air is not going over the radiator, between the radiator and hood, or around it..
     
    scrap metal 48 likes this.
  8. BJR
    Joined: Mar 11, 2005
    Posts: 6,327

    BJR
    Member

    Push fans block the radiator, If you are running a mechanical fan and a pusher, remove the pusher and install a shroud on the mechanical fan.
     
    Blue One likes this.
  9. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    What about CFMs??
     
  10. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Yep, have all the gaps blocked off. Yes I having been playing with different ideas on a shroud for the current set up.
     
  11. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Sounds good , just wondering wouldn't the pusher help in stopped traffic or slow traffic. I wonder if that is why the PO put the pusher on it.?
     
  12. The pusher was probably his band aid. Many questions. What do you consider too hot? Are you sure the gauge works? Do you know if the timing is right?
     
  13. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Right, I am sure the pusher was a band aid. He put a performance cam in. Hard to get the timing and idle right. The plugs look good. The temp gauge is correct "new" i checked it with a hand held laser temp gauge. I was on here months ago getting the timing dialed in. But it is in the triple digits now here in NM, so.... When it starts crawling above 200 degrees I get nervous. Running around town, 190 degrees which is ok, I believe.... Winter time it stays around 160-170 degrees.
     
    Tman likes this.
  14. 48ford
    Joined: Dec 15, 2001
    Posts: 431

    48ford
    Member

    Do the simple things first
    Try putting paper on the grill,when it’s running.
    Does it stay there or fall off?
    If it stays put, your pulling enough air
     
    67L36Driver likes this.
  15. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    It stays.
     
  16. squirrel
    Joined: Sep 23, 2004
    Posts: 46,066

    squirrel
    Member

    200 is normal operating temp on modern cars....230 is about as high as I like to go, but 240 won't hurt anything. Some engines start to run bad when they get much over 200, mostly due to fuel percolating issues.

    We don't have pictures, so it's hard to see what you're seeing.
     
  17. Let's see what your fan looks like. HRP
     
  18. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    IMG_20200610_170647950.jpg
     

    Attached Files:

  19. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    It has an older 350 small block.
     
  20. squirrel
    Joined: Sep 23, 2004
    Posts: 46,066

    squirrel
    Member

    I expect a shroud would help a lot. Looks like there's probably not much you can do easily about the cross member, unfortunately.
     
  21. BJR
    Joined: Mar 11, 2005
    Posts: 6,327

    BJR
    Member

    With that much space between the fan and the core, and that much core above the fan, I bet a good shroud would fix all your heating issues. Also what Lbs is your radiator cap? Is it boiling over?
     
  22. jimmy six
    Joined: Mar 21, 2006
    Posts: 6,321

    jimmy six
    Member

    14” mechanical fan. Shroud kit from Summit for circle track, opening is 15”. Stock 40 Chevrolet radiator size upgraded, 10-1 311” GMC 6, no heating problems. 499CD279-46BD-4921-9F58-06156E8EFFF5.jpeg
     
  23. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Seven lb cap. I dont believe it has boiled over. I have seen the thread on the home made shrouds, very cool. I will try a diy shroud first and see what happens.
     
    squirrel likes this.
  24. sdluck
    Joined: Sep 19, 2006
    Posts: 2,407

    sdluck
    Member

    Does the dist have a vacuum advance,is it hooked to manifold vacuum,
     
  25. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Hooked to lower port on carb. I tried the manifold port, no noticeable difference.
     
  26. sdluck
    Joined: Sep 19, 2006
    Posts: 2,407

    sdluck
    Member

    How much total timing and @ what rpm?
     
  27. sdluck
    Joined: Sep 19, 2006
    Posts: 2,407

    sdluck
    Member

    There should be a big difference,Are you sure the vacuum advance is working. Which carb the lower port on some carbs is still ported,check with a vacuum guage.
     
  28. sdluck
    Joined: Sep 19, 2006
    Posts: 2,407

    sdluck
    Member

    Fan is pretty far from the Rad
     
    belair likes this.
  29. Almostdone
    Joined: Dec 19, 2019
    Posts: 244

    Almostdone
    Member

    The pictures helped us a lot. That is a small fan, but it’s mostly about the shroud. The pusher in addition to the mechanical fan is likely a band aid as stated earlier. You may be fine without the pusher if you get a shroud. Plus, in the electric fan world pullers are much preferred over pushers.
    Try a shroud and if it does not help go with a high quality electric puller and a shroud. Blades of a mechanical fan should be 1/2 in and 1/2 out of the shroud.

    You might think about why it it getting hot in the first place. Maybe timing, etc. should be considered. Does it get hot just when moving slow, or also when traveling at highway speeds, etc.
     
  30. Karl M
    Joined: Jul 19, 2017
    Posts: 119

    Karl M

    Closest point on the blades to rad is 2 inches. Vacuum on ports is just under 12 hg. ...His performance cam....?
     

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